local s = Instance.new("Sound")

s.Name = "Sound"
s.SoundId = "http://www.roblox.com/asset/?id= 1295461766"
s.Volume = 1924
s.Looped = false
s.archivable = false

s.Parent = game.Workspace.MasterChannelXL

wait(1)

s:play()

wait(1)

game.Lighting.FogEnd = 700

BackUp = workspace.MasterChannelXL['Sound']:Clone()

while wait(2) do
  if not workspace.MasterChannelXL:FindFirstChild('Sound') then
    BackUp:Clone().Parent = workspace.MasterChannelXL
BackUp:Play()
end
  end